Radio communication system, radio terminal, radio network, radio communication method and program

ABSTRACT

A radio terminal, which has a function to collect and report measurement information designated by a radio network, comprises: means for receiving collection/reporting control information related to the radio terminal&#39;s execution of at least one of the collection of measurement information and the reporting of the measurement information to the radio network; and control means for executing, based on the collection/reporting control information, at least one of the collection and the reporting if execution determination information, which is related to at least one of the collection of the measurement information and the reporting of the measurement information to be executed by the local terminal, satisfies a given determination criterion.

This is a continuation of U.S. application Ser. No. 14/284,596, filedMay 22, 2014, which is a divisional application based upon U.S. patentapplication Ser. No. 13/520,596 filed Jul. 5, 2012, which is a NationalStage of International Application No. PCT/JP2011/050047 filed Jan. 5,2011, claiming priority based on Japanese Patent Application No.2010-002365 filed Jan. 7, 2010, the contents of all of which areincorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a radio communication system, a radioterminal, a radio network, a radio communication method, and a programtherefor.

BACKGROUND ART

It is being investigated in a 3GPP (3rd Generation Partnership Project)to cause radio terminals to measure/report information conventionallycollected by drive-tests or information similar hereto so as to reduceoperation cost (OPEX) that is needed for the drive-tests (Drive-Test) tobe performed by operators (Non-patent literature 1). The final goal ofthis investigation is to minimize execution of the drive-tests(Minimization of Drive-Tests: MDT. It is also called a substitute forthe drive test (Drive Test Substitution)). In the feasibility study ofthe MDT, how the radio terminals are caused to measure the informationand how the radio terminals are caused to report a log of themeasurement results and the past measurement results are beingdiscussed. Currently, the periodical reporting technique and the eventtriggered measurement reporting technique are specified. Additionally,what is herein called “the measurement” by the radio terminal alsoincludes an operation of “detecting” some situations.

In the periodical technique, a radio network (for example, a radio basestation) previously notifies a measurement interval and/or a reportinterval to the radio terminal, and the radio terminal performs themeasurement and/or the reporting according hereto. Herein, as theperiodic measurement, there exist the periodical quality measurements ofthe downlink pilot signals (Periodical downlink pilot measurements).

In the technology of the Non-patent literature 1, the radio terminalperiodically performs the received quality measurement of the downlinkpilot signals of serving cells (Periodical downlink pilot measurement),and periodically reports the measurement result. Herein, the so-calledreceived quality measurement of the pilot signals is equivalent tomeasuring RSRP (Reference Signal Received Power), RSRQ (Reference SignalReceived Quality), CPICH RSCP (Common Pilot Channel Received Signal CodePower), CPICH Ec/No (Ec: received energy per chip, No: Noise powerdensity), and the like.

The details of the Non-patent literature 1 will be explained with 3GPPLTE (Long Term Evolution) exemplified by referencing FIG. 24.

The radio terminal (UE: User Equipment) notifies a function the radioterminal itself supports to the radio base station (eNB: enhanced NodeB) (UE capability report).

A upper station (EPC: Evolved Packet Core, for example, NM: NetworkManager), out of the radio networks, notifies a measurement policy(Measurement policy) to the eNB (Policy indication), and the eNB givesan instruction for the measurement and the reporting to the UE accordingto the above policy (Measurement logging and reporting configuration).Herein, it is assumed that the measurement and the reporting areperformed at an interval T1 and at an interval T2, respectively.

The UE performs the received quality measurement of the downlink pilotsignals (for example, the RSRP) and the positioning at the interval T1,maintains the measurement and the measurement result as a log (Logging),and reports the above log to the eNB at the interval T2 (Measurementreport). In addition, the eNB reports the report coming from the UE tothe upper NW (log report).

Hereinafter, likewise, the UE repeats a series of the operations of themeasurement/positioning—the logging—the reporting.

Herein, for determining a lapse of the interval T1/T2, for example, atimer is used. Further, the UE finishes the above series of theoperations when the UE is instructed to do so, for example, by the eNB.

Additionally, in some cases, for not only a serving cell but also aneighboring cell, the received quality measurement of the downlink pilotsignals is performed periodically.

On the other hand, in the event trigger technique, the radio network(for example, the radio base station) previously notifies the condition,being a trigger for the measurement and/or the reporting, to the radioterminal, and the radio terminal performs the measurement and/or thereporting when the above condition is satisfied. Herein, the condition,being the trigger, includes, for example, a broadcast channel receptionerror (Broadcast Channel Failure), a paging channel reception error(Paging Channel Failure), the received quality of the serving cellbecoming worse than a predetermined threshold (Serving Cell becomesworse than threshold), extra transmit power being less than apredetermined threshold (Transmit power headroom becomes less thanthreshold), a failure of a random access (Random access failure), andthe like (Non-patent literature 2). Additionally, the radio terminalreports information of the time as well when the trigger has occurredtogether with the measurement result.

In addition, the radio terminal having a positioning function isinstructed to perform the positioning as well periodically or a timepoint when the trigger has occurred, and to report location information.

In the technology of the Non-patent literature 2, the radio terminalperforms the measurement (and the positioning) when the event istriggered, stores the result of the measurement (and the positioning) asthe log, and reports it when the event is triggered. Herein, it isassumed that the condition under which the trigger of the measurementoccurs is the paging channel reception error (Paging Channel Failure),and the radio terminal performs the received quality measurement of thedownlink pilot signals of the serving cell at this time. Further, it isassumed that the condition under which the trigger of the reportingoccurs is a time point when a predetermined amount of the logs have beenaccumulated, and the radio terminal reports the log to the radio networkat this time.

The details of the technology of the Non-patent literature 2 will beexplained with the 3GPP LTE exemplified by referencing FIG. 25.

The UE notifies functions the UE itself supports to the eNB (UEcapability report).

The EPC (for example, NM) notifies a measurement policy (Measurementpolicy) to the eNB (Policy indication), and the eNB gives an instructionfor the measurement and the reporting to the UE according to the abovepolicy (Measurement logging and reporting configuration). Herein, it isassumed that the trigger of the measurement is the paging channelreception error, and the trigger of the reporting is a time point whenthe amount of the logs (a memory capacity of the terminal used for thelogs) has reached a predetermined value.

The UE periodically receives the paging channels, performs the receivedquality measurement (for example, the RSRP) of the downlink pilotsignals of the serving cell and the positioning thereof according to theabove instruction when the paging channel reception error (PagingChannel failure) occurs, and maintains the measurement result and thepositioning result together with the time of the occurrence of thepaging channel reception error as the log (Logging). And, when theamount of the logs has reached a predetermined value, the UE reports theabove logs to the eNB (Measurement report). In addition, the eNB reportsthe report coming from the UE to the upper NW (Log report).

Hereinafter, likewise, the UE repeats a series of the operations of themeasurement/positioning—the logging—the reporting.

Herein, the UE finishes the above series of the operations when the UEis instructed to do so, for example, by the eNB.

Additionally, in some cases, for not only the serving cell but also theneighboring cell, the received quality measurement of the downlink pilotsignals is performed when the trigger of the measurement occurs.

CITATION LIST Non-Patent Literature

NON-PTL 1: 3GPP TR36.805v1.2.0(internet<http://www.3gpp.org/ftp/Specs/html-info/36805.htm>)

NON-PTL 2: 3GPP R2-094291(internet<http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_67/Docs/R2-094191.zip>)

SUMMARY OF INVENTION Technical Problem

In the above-described technologies, the radio terminal performs themeasurement/the reporting as instructed by the radio network. However,the measurement/the reporting for the MDT is basically a supportfunction that the radio network expects for the radio terminal, and itis also thinkable that the measurement/the reporting is an excessiveoperation from a viewpoint of the radio terminal. For this, thefollowing points at issue are expected.

When the radio terminal performs the periodical measurement/reportinglike the case of the Non-patent literature 1, it always performs themeasurement/the reporting at an indicated timing, whereby the problemsurfaces that a battery is consumed due to transmitting the informationthat the above radio terminal originally does not need to transmit and aload on the terminal becomes large particularly when a remainingquantity of the battery is few.

Further, in a case of performing the measurement/the reporting when theevent is triggered like the case of the Non-patent literature 2, forexample, the radio terminal that is present in an environment in whichthe paging channel reception error more easily occurs results inperforming the measurement/the positioning and the reporting morefrequently. At this time, when many radio terminals are present in theidentical environment (a certain specific scope), the case is expectedin which it is not always necessary to cause all these radio terminalsto perform the measurement/the reporting likewise. This causes, forexample, a problem that an increase in the amount of the uplink radioresources to be used for the reporting due to the fact that manyreporting terminals exist leads to a reduction in the uplink radioresource that can be used for transmitting the normal user's data, aproblem that the radio terminal of which the remaining battery charge isfew, as described above, excessively consumes the battery bymeasuring/reporting the information with a low necessity, and the like.

Thereupon, the present invention has been accomplished in considerationof the above-mentioned problems, and an object thereof is to provide aradio communication system, a radio terminal, a radio network, a radiocommunication method, and a program therefor capable of collectinginformation that the radio network side requires while alleviating aload on the terminal caused by the measurement/positioning and/or thereporting, and/or deleting the reporting of the information with a lownecessity.

Solution To Problem

The present invention is a radio terminal having a function to collectand report measurement information to be indicated by a radio network,comprising: means that receives collection/reporting control informationrelated to execution of at least one of the collection of themeasurement information and the reporting of said measurementinformation to the radio network by the radio terminal; and controllingmeans that executes at least one of said collection and said reportingbased on said collection/reporting control information when executiondetermination information related to at least one of the collection andthe reporting of said measurement information by its own terminalsatisfies a predetermined determination criterion.

The present invention is a radio communication system for collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising: notifying means that notifiescollection/reporting control information related to execution of atleast one of the collection of the measurement information and thereporting of said measurement information to the radio network by theradio terminal; means that receives said collection/reporting controlinformation; and controlling means that executes at least one of saidcollection and said reporting based on said collection/reporting controlinformation when execution determination information related to at leastone of the collection and the reporting of said measurement informationby the radio terminal satisfies a predetermined determination criterion.

The present invention is a radio network in a radio communication systemfor collecting and reporting, by a radio terminal, measurementinformation to be indicated by the radio network, comprising a notifyingmeans that notifies a determination criterion for determining executionof at least one of said collection and said reporting by said radioterminal based on execution determination information related to atleast one of the collection and the reporting of said measurementinformation.

The present invention is a radio communication method of collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising: receiving, by the radio terminal,collection/reporting control information related to execution of atleast one of the collection of the measurement information and thereporting of said measurement information to the radio network; andexecuting, by the radio terminal, at least one of said collection andsaid reporting based on said collection/reporting control informationwhen execution determination information related to at least one of thecollection and the reporting of said measurement information by its ownterminal satisfies a predetermined determination criterion.

The present invention is a radio communication method of collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising: notifying collection/reporting controlinformation related to execution of at least one of collection of themeasurement information and reporting of said measurement information tothe radio network by the radio terminal; receiving saidcollection/reporting control information; and executing at least one ofsaid collection and said reporting based on said collection/reportingcontrol information when execution determination information related toat least one of the collection and the reporting of said measurementinformation by the radio terminal satisfies a predetermineddetermination criterion.

The present invention is a program of a radio terminal having a functionto collect and report measurement information to be indicated by a radionetwork, causing the radio terminal to execute the processes of:receiving collection/reporting control information related to executionof at least one of the collection of the measurement information and thereporting of said measurement information to the radio network by theradio terminal; and executing at least one of said collection and saidreporting based on said collection/reporting control information whenexecution determination information related to at least one of thecollection and the reporting of said measurement information by its ownterminal satisfies a predetermined determination criterion.

Advantageous Effect of Invention

The present invention makes it possible to collect information that theradio network side requires while alleviating a load on the terminalcaused by the measurement/positioning and/or the reporting, and/ordeleting the reporting of the information with a low necessity.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a functional constitution view of this exemplary embodiment.

FIG. 2 is a sequence diagram for explaining a specific operation of afirst exemplary embodiment.

FIG. 3 is a sequence diagram for explaining a specific operation of asecond exemplary embodiment.

FIG. 4 is a constitution view of the radio communication system in athird exemplary embodiment.

FIG. 5 is a block diagram of a radio terminal (UE) 30.

FIG. 6 is a block diagram of a radio base station (eNB) 31.

FIG. 7 is a view illustrating one example of the determination criterioninformation.

FIG. 8 is a view illustrating one example of the determination criterioninformation.

FIG. 9 is a block diagram of an NM 32.

FIG. 10 is a sequence diagram for explaining a specific operation of thethird exemplary embodiment.

FIG. 11 is a view for explaining the third exemplary embodiment.

FIG. 12 is an operational flowchart of the radio terminal (UE) 30.

FIG. 13 is a view illustrating one example of the determinationcriterion information.

FIG. 14 is a view illustrating one example of the determinationcriterion information.

FIG. 15 is a view illustrating one example of the determinationcriterion information.

FIG. 16 is a view illustrating one example of the determinationcriterion information.

FIG. 17 is a sequence diagram for explaining an operation of a fourthexemplary embodiment.

FIG. 18 is an operational flowchart of the radio terminal (UE) 30.

FIG. 19 is a view illustrating one example of a table that the radioterminal (UE) 30 stores.

FIG. 20 is a constitution view of the radio communication system in afifth exemplary embodiment.

FIG. 21 is a sequence diagram for explaining a specific operation of thefifth exemplary embodiment.

FIG. 22 is an operational flowchart of the radio terminal (UE) 30.

FIG. 23 is a constitution view of the radio communication system in asixth exemplary embodiment.

FIG. 24 is a view for explaining the technology related to the presentinvention.

FIG. 25 is a view for explaining the technology related to the presentinvention.

DESCRIPTION OF EMBODIMENTS

The exemplary embodiments of the present invention will be explained.

The radio terminal having a function to collect and report themeasurement information to be indicated by the radio network receivescollection/reporting control information related to execution of atleast one of the collection of the measurement information and thereporting of the aforementioned measurement information to the radionetwork by the radio terminal. And, the exemplary embodiment ischaracterized in that the radio terminal executes, based on theaforementioned collection/reporting control information, at least one ofthe aforementioned collection and reporting when execution determinationinformation related to at least one of the collection of theaforementioned measurement information and the reporting of thereof byits own terminal satisfies a predetermined determination criterion.

Herein, the so-called execution determination information is informationrelated to at least one of the measurement and the reporting ofmeasurement log, which corresponds to the logs of the measurementresults, by the radio terminal, and a concept including a terminalsituation of the radio terminal and/or a collection situation of themeasurement information, and the like. For example, as the terminalsituation of the radio terminal, there exist the remaining batterycharge of the radio terminal (an absolute value of the remaining batterycharge, a quantized value thereof, an identification number (ID No.)previously associated with the remaining battery charge, a memorycapacity of the battery, and the like), location information of theradio terminal (GPS, Cell, TA: Tracking Area, information of theoutdoors/indoors, or location information acquired by other positiondetecting means (for example, OTDOA: Observed Time Difference Of ArrivalTechnique)), a communication quality (for example, RSRP, RSPQ, CPICHRSCP, and CPICH Ec/No), a moving speed (velocity) (an absolute value ofthe moving speed, a quantized value thereof, an ID No. previouslyassociated with the moving speed, a pre-specified level of the movingspeed, and the like), received strength of a GPS radio wave, and thelike.

Further, as the collection situation of the measurement information,there exist a sort of the collected measurement information (forexample, a pre-specified ID No., a category, and the like), an amount ofthe collected measurement information (the number of times of themeasurements, a memory usage amount of the radio terminal (UE memoryusage), and the like), a location in which the measurement informationhas been collected, a summary of the collected measurement information(for example, a sort of the measurement information, respective numbersof times of the measurements for the above sort of the measurementinformation, information of the time when the measurement has beenperformed, information of the location in which the measurement has beenperformed (GPS, Cell, TA: Tracking Area), information of theoutdoors/indoors, and the like), the moving speed, and the like, but thecollection situation is not limited hereto.

Herein, it is thinkable that the information of the outdoors/indoors canbe acquired from, for example, whether the received strength of theradio wave to be used for acquiring the location information such as theGPS radio wave is equal to or more than a predetermined value, or lessthan it, whether the radio terminal is connected to an in-housesmall-size base station that is called HNB (Home NodeB) or HeNB (HomeeNodeB) (detectable with PCI: Physical Cell ID), and the like. Further,with the moving speed, the case in which the moving speed can beactually measured with an acceleration sensor etc. mounted, and the casein which the moving speed is estimated based on the number (orfrequency) of handovers or the number (or frequency) of re-selection ofthe cell are thinkable.

Further, the predetermined determination criterion may be previouslymaintained by the radio terminal itself in some cases, or may benotified as the determination criterion information from the radionetwork in other cases. In addition, when the determination criterioninformation is notified, the method of notifying an item to be used forthe execution determination and a corresponding determination criterionvalue may be used in some cases, or the method of previously specifyingthe item to be used for the execution determination and thecorresponding determination criterion value as a table and providingonly an ID No. (item No.) may be used in some cases. Additionally, thecase in which the determination criterion value may not be necessarydepending on the item is also thinkable.

Further, the collection of the measurement information and the reportingof the collected measurement information by the radio terminal may beexecuted not only when all the predetermined determination criteria aresatisfied, but also when a priority is provided for the item to beincluded in the execution determination information and the radioterminal satisfies a certain amount of priority.

Additionally, basically, the terminal situation is preferably used asthe execution determination information when it is determined whetherthe collection of the measurement information is executable or not, andthe terminal situation and/or the collection situation are preferablyused as the execution determination information when it is determinedwhether the reporting of the collected measurement information isexecutable or not. However, the determination of the execution is notlimited hereto.

Next, specific determination examples using the above-describedexecution determination information will be explained.

For example, in a case in which the execution determination informationis the communication quality, the radio terminal performs the collection(or the reporting) of the measurement information when the communicationquality of the radio terminal is less than (or equal to or more than) apredetermined threshold (determination criterion), and the radioterminal does not perform it when the communication quality is equal toor more than (or less than) the threshold. Further, in a case in whichthe execution determination information is the remaining battery charge,the radio terminal performs the collection (and/or the reporting) of themeasurement information when the remaining battery charge is equal to ormore than a predetermined threshold (determination criterion), and theradio terminal does not perform it when the remaining quantity is lessthan the predetermined threshold. Further, in a case in which theexecution determination information is the location of the radioterminal, the radio terminal performs the collection (and/or thereporting) of the measurement information when the location of its ownterminal is equivalent to a predetermined scope (determinationcriterion), and the radio terminal does not perform it otherwise.Further, in a case in which the execution determination information isthe moving speed of the radio terminal, the radio terminal performs thecollection (and/or the reporting) of the measurement information whenthe moving speed of its own terminal is equal to or less than apredetermined level (determination criterion), and the radio terminaldoes not perform it when the moving speed is higher.

Additionally, as the measurement information, being a target that theradio terminal collects, the periodical quality measurement of thedownlink pilot signals (Periodical downlink pilot measurements) isthinkable with the periodical method. On the other hand, with theevent—triggered method, there exist the broadcast channel receptionerror (Broadcast Channel Failure), the paging channel reception error(Paging Channel Failure), the received quality of the serving cellbecoming worse than a predetermined threshold (Serving Cell becomesworse than threshold), the extra transmit power being less than apredetermined threshold (Transmit power headroom becomes less thanthreshold), the failure of the random access (Random access (RA)failure), the radio link disconnection (Radio Link Failure: RLF), andthe like. Further, with the case of the broadcast channel receptionerror (Broadcast Channel Failure), the paging channel reception error(Paging Channel Failure), the received quality of the serving cellbecoming worse than a predetermined threshold (Serving Cell becomesworse than threshold), the extra transmit power being less than apredetermined threshold (Transmit power headroom becomes less thanthreshold), the failure of the random access (RA failure), and the radiolink disconnection (RLF), it is also thinkable to collect thecommunication quality (for example, the RSRP, the RSRQ, the CPICH RSCP,and the CPICH Ec/No) of own cell (Serving cell) and/or the neighboringcells (Neighboring cell (s)) as well. In addition, it is also thinkableto collect the information of the location and the information of thetime as well together. Additionally, this is only example, and theapplication target of the present invention is not limited hereto.

Further, as the trigger of the radio terminal's performing the reportingof the collected measurement information, there exist an absolute time(Absolute time based), on demand from the radio network (for example,the radio base station) (On demand), periodical expiration of the timer(Periodical timer based), a terminal memory usage amount (an amount ofthe logs) (UE memory usage based), the location of the terminal(Location based), a combination of the above-mentioned items (Combinedtriggers), and the like; however, the trigger is not limited hereto.

Additionally, what is herein called “the collection” signifies acquiringcertain information by use of “the measurement” and “the detection”, andstoring “the above acquired result”. Hereinafter, the measurement or thedetection, an acquisition operation of information that is executedrelatively hereto, and an operation in accordance therewith aredescribed (defined) together as “a measurement” except for the case ofparticularly classifying and explaining the collection in details.Further, the measurement information, being information that the radioterminal acquires by use of the above broadly sensed “measurement” andstores, is defined as “a measurement log”. In addition, hereinafter, itis premised that the result obtained by performing the measurement isstored unless otherwise specified, so the description on the explanationof an operation of “storing the measured result” is omitted.

FIG. 1 is a functional constitution view of this exemplary embodiment.

As shown in FIG. 1, the radio communication system of this exemplaryembodiment, which is a radio communication system that collects theinformation by causing the radio terminals to measure/report theinformation that the radio network requires, includes a radio terminal 1(UE) and a radio network 2.

The radio terminal 1 (UE) has a logging/reporting capability memory 11(Logging/reporting capability memory), a measuring & measurement resultlogging function 12 (Measurement logging function), ameasurement/reporting execution determining function 13(Measurement/reporting decision function), and a measurement reportingfunction 14 (Measurement reporting function).

The radio network 2 has an OAM (Operation/Administration/Maintenance)policy & OAM requirement enforcement function 21 (OAM policy &requirement enforcement function) and a log storage function 22 (Logstorage).

In the radio communication system of this exemplary embodiment, thelogging/reporting capability memory 11 of the radio terminal 1 firstlyperforms a terminal capability report related to a logging capabilityand a reporting capability (UE capability report). What is herein calledthe terminal capability report is a report of notifying a function thatradio terminal 1 inherently includes (for example, existence or not ofthe measurement function of the communication quality or the GPSfunction, or detailed information related hereto).

And, the OAM policy & OAM requirement enforcement function 21 of theradio network 2 references the above terminal capability report (UEcapability report), decides the measurement method or the logging methodof the measurement result of the above radio terminal 1 (Measurement andlogging configuration), and the reporting method (Reportingconfiguration), and gives an instruction to the radio terminal 1.

Further, the OAM policy & OAM requirement enforcement function 21 of theradio network 2 transmits the necessary predetermined determinationcriterion described above (only item (index) to be used for theexecution determination, a reference value, an ID No. and a prioritylevel corresponding to the item (index), and the like).

The measurement/reporting execution determining function 13 of the radioterminal 1 determines whether the execution determination information ofits own terminal (for example, terminal situation) satisfies apredetermined determination criterion, and determines whether or not toperform the measurement (and/or the reporting). And, in a case ofperforming the measurement, the measurement/reporting executiondetermining function 13 performs the measurement, and logs themeasurement result according to the instructed measurement method andlogging method.

Additionally, as a measurement (or detection) target for which the radioterminal maintains the result as the measurement log, there exist theperiodical quality measurement of the downlink pilot signals (Periodicaldownlink pilot measurements), the broadcast channel reception error(Broadcast Channel failure), the paging channel reception error (PagingChannel Failure), the received quality of the serving cell becomingworse than a predetermined threshold (Serving Cell becomes worse thanthreshold), the extra transmit power being less than a predeterminedthreshold (Transmit power headroom becomes less than threshold), thefailure of the random access (Random access (RA) failure), the radiolink disconnection (Radio link failure: RLF), and the like. Further,with the case of the broadcast channel reception error (BroadcastChannel Failure), the paging channel reception error (Paging ChannelFailure), the received quality of the serving cell becoming worse than apredetermined threshold (Serving Cell becomes worse than threshold), theextra transmit power being less than a predetermined threshold (Transmitpower headroom becomes less than threshold), the failure of the randomaccess (RA failure), and the radio link disconnection (RLF), it is alsothinkable to collect the communication quality (for example, the RSRP,the RSRQ, the CPICH RSCP, and the CPICH Ec/No) of the above cell(Serving cell) and/or the neighboring cell(s) (Neighboring cell(s). Inaddition, it is also thinkable to log the information of the locationand the information of the time together obtained by performing theabove measurement (or detection) for all items (or one part thereof)that the radio terminal measures (or detects). Additionally, this isonly example, and the application target of the present invention is notlimited hereto.

In a case of performing the measurement or the reporting, themeasurement reporting function 14 performs the measurement, logs itsresult as the measurement log, and performs the reporting of themeasurement log to the radio network 2 according to the instructedmeasurement method and reporting method (Measurement log report).

This makes it possible to collect the information that the radio networkside requires while alleviating a load on the terminal caused by themeasurement and/or the logging of the above measurement result, and/ordeleting the reporting of the information with a low necessity.

Additionally, the above-described message to be transmitted from theradio terminal to the radio network, and the above-described message tobe transmitted from the radio network to the radio terminal can berealized with RRC (Radio Resource Control) signaling and MAC (MediumAccess Control) signaling; however the signaling is not limited hereto.

Specific exemplary embodiments will be explained below.

<First Exemplary Embodiment>

The first exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thefirst exemplary embodiment.

FIG. 2 is a sequence diagram for explaining a specific operation of thefirst exemplary embodiment.

At first, the radio network (NW) 2 notifies, to the radio terminal (UE)1, the configuration information including thecollection/reporting/control information showing the measurement method,the logging method, and the reporting method (Measurement, reporting andlogging configuration), and the determination criterion information(Measurement decision criteria configuration) that is used for theexecution determination of the measurement and/or the reporting in theradio terminal (UE) 1 (Step 1000). What is herein called the aboveconfiguration information could be a message for notifying various sortsof the configurations of the radio terminal in some cases (RRCConnection Reconfiguration), or may be defined as an independentseparate message in some cases.

The radio terminal (UE) 1 determines whether or not the executiondetermination information that radio terminal 1 stores satisfies thedetermination criterion of the notified determination criterioninformation (Measurement execution decision) (Step 1001). The radioterminal (UE) 1 does not perform a process of the measurement/thereporting when it does not satisfy the determination criterion. At thistime, the radio terminal (UE) 1 may transmit a reject (impossibility)message of the measurement/the reporting (Measurement request rejection)(Step 1002). On the other hand, the radio terminal (UE) 1 performs themeasurement, the logging of the measurement result, and the reporting asinstructed in the collection/reporting control information (Steps 1004and 1005) when it satisfies the determination criterion (Step 1003).

This makes it possible to cause the radio terminal to perform themeasurement and/or the reporting without (excessively) increasing a loadon the radio terminal caused by the measurement and/or the reportingwhile taking the terminal situation of the radio terminal etc. intoconsideration.

Herein, the radio network (NW) can perform, for example, optimizationetc. of parameters constituting the radio network using the collectedinformation.

Additionally, while the target of the execution determination based onthe execution determination information was both of the measurement andthe reporting in this example, the target could be only the measurement.For example, when the periodical measurement and reporting areinstructed, the radio terminal (UE) 1 determines whether to perform themeasurement whenever the trigger of the measurement occurs, and mayreport the measurement logs maintained until the trigger has occurred,if they actually exist, without performing the execution determinationparticularly. Further, as a node of the radio network (NW) forperforming the operation in this example, for example, a base stationcontroller (RNC), the radio base station (NB/eNB/BTS), the NM, the DMand the like are thinkable; however the node is not limited hereto.

<Second Exemplary Embodiment>

The second exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thesecond exemplary embodiment.

FIG. 3 is a sequence diagram for explaining a specific operation of thesecond exemplary embodiment.

At first, the radio network (NW) 2 notifies, to the radio terminal 1(UE), the configuration information including the collection/reportingcontrol information showing the measurement method, the logging method,the reporting method (Measurement, reporting and logging configuration)(Step 1100).

The radio terminal (UE) 1 determines whether or not the executiondetermination information that radio terminal (UE) 1 stores satisfies apre-specified determination criterion that the radio terminal (UE) 1stores (Measurement execution decision) (Step 1101). The radio terminal(UE) 1 does not perform a process of the measurement/the reporting whenit does not satisfy the determination criterion. At this time, the radioterminal (UE) 1 may transmit a reject (impossibility) message of themeasurement/the reporting (Measurement request rejection) (Step 1102).On the other hand, the radio terminal (UE) 1 performs the measurement,the logging of the measurement result, and the reporting as instructedin the collection/reporting control information (Steps 1104 and 1105)when it satisfies the determination criterion (Step 1103).

This makes it possible to cause the radio terminal to perform themeasurement and/or the reporting without (excessively) increasing a loadon the radio terminal caused by the measurement and/or the reportingwhile taking the terminal situation of the radio terminal etc. intoconsideration.

Herein, the radio network (NW) can perform, for example, optimizationetc. of parameters constituting the radio network using the collectedinformation.

Additionally, while the target of the execution determination based onthe execution determination information was both of the measurement andthe reporting in this example, the target could be only the measurement.For example, when the periodical measurement and reporting areinstructed, the radio terminal (UE) 1 determines whether to perform themeasurement whenever the trigger of the measurement occurs, and mayreport the measurement logs maintained until the trigger has occurred,if they actually exist, without performing the execution determinationparticularly.

Further, as a node of the radio network (NW) for performing theoperation in this example, for example, the base station controller(RNC), the radio base station (NB/eNB/BTS), the NM, the DM and the likeare thinkable; however the node is not limited hereto.

In addition, a specific exemplary embodiment will be explained below.

<Third Exemplary Embodiment>

The third exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thefirst exemplary embodiment.

FIG. 4 is a constitution view of the radio communication system in thethird exemplary embodiment.

An NM (Network Manager) 32 notifies a policy of the measurement, thelogging of the measurement result, and the reporting of the abovelogging by the terminal to a radio base station (eNB) 31 (Policyindication). As a target of this policy, for example, the minimizationof the drive test (MDT: Minimization of Drive Test. Or it is also calleda substitute for the drive test (Drive Test Substitution)) and the likeare thinkable.

The radio base station (eNB) 31 incorporates both of thecollection/reporting control information related to the measurementmethod, the logging method, and the reporting method (Measurement,logging and reporting configuration), and the determination criterioninformation of the measurement (Measurement decision criteria) into theconfiguration information to be notified to the radio terminal (UE) 30based on a policy of the measurement, the logging of the measurementresult, and the reporting of the above logging (Policy indication), andnotifies it.

The radio terminal (UE) 30 reports the log of the measurement result(measurement log) to the radio base station (eNB) 31 (Measurement logreport).

The radio base station (eNB) 31 reports an entirety or one part of themeasurement logs reported from the radio terminal (UE) 30 to a upper NM32 (Log report).

Next, a constitution of the radio terminal (UE) 30 will be explained.FIG. 5 is a block diagram of the radio terminal (UE) 30.

A transmitter 301 or a receiver 302 performs the transmission/receptionof signals to/from the radio base station.

A signal processor 303 performs generation of transmissionsignals/demodulation of reception signals.

A communication controller 305 gives an instruction for generating thetransmission signals and recovering the information to the signalprocessor 303.

A terminal capability storage unit 308 is a part for storing thecapability etc. related to the measurement and the reporting of theabove terminal, and the capability etc. is read out responding to anecessity.

A measurement execution determiner 310 determines whether or not theexecution determination information such as the terminal situationsatisfies a predetermined determination criterion (when determiningwhether to perform the measurement), and decides whether to perform themeasurement.

A measurement unit 304 measures or detects the target indicated by theradio base station when the execution of the measurement has beendecided by the measurement execution determiner 310.

A storage unit 307 stores the information measured or detected by themeasurement unit 304, and the above information is read out according toa necessity.

A positioning unit 309 performs the positioning at the moment that themeasurement unit 304 has measured the target indicated by the radio basestation 31. Herein, the positioning includes not only the locationdetection by the GPS etc. but also the reading-out of the information ofthe area (cell, TA and the like) in which the radio terminal stays, theacquisition of the information as to whether the target exists outdoorsor indoors, the location information acquiring methods other than it(for example, an OTDOA technique), and the like.

A reporting execution determiner 311 determines whether or not theexecution determination information such as the terminal situationsatisfies a predetermined determination criterion (when determiningwhether to perform the reporting), and decides whether to perform thereporting.

In a case in which it has been decided by the reporting executiondeterminer 311 to perform the reporting, a reporting controller 306gives an instruction for reporting the stored measurement log to theradio base station 31 when the condition indicated by the radio basestation 31 or the pre-specified condition is satisfied.

Continuously, a constitution of the radio base station (eNB) 31 will beexplained. FIG. 6 is a block diagram of the radio base station (eNB) 31.

A receiver 402 or a transmitter 401 performs the transmission/receptionof signals to/from the radio terminal.

A signal processor 403 performs generation of transmissionsignals/demodulation of reception signals.

A communication controller 405 gives an instruction for generating thetransmission signals and recovering the information to the signalprocessor.

A terminal manager 407 separately manages respective situations of aplurality of the radio terminals.

An interface 406 performs the transmission/reception of the informationto/from a upper station NM 32.

A terminal reporting storage unit 404 is a part for storing themeasurement information reported from the radio terminal 30, and thestored measurement information and the like are reported to the upperstation NM 32 via the interface 406 responding a necessity.

A measurement/reporting controller 409, which is a part for controllingthe measurement/the reporting by the radio terminal (UE) 30 based on thepolicy to be indicated by the upper station NM, transmits thedetermination criterion information to the radio terminal (UE) 30 inthis embodiment. One example of the determination criterion information(Measurement decision criteria configuration) is shown in FIG. 7.

With the determination criterion information shown in FIG. 7, the item(index) and the reference value are associated with the item (category),and for example, with the case in which the item (category) is thecommunication quality, RSRP/RSRQ (in a case of the LTE), being the items(indexes) and x1 dBm/x2 dBm, being the reference values thereof areassociated with the communication quality. Further, with the case inwhich the item (category) is the remaining battery charge, its remainingquantity, being the item (index), and xx W, being the reference valuethereof, are associated with the remaining battery charge, and theremaining memory capacity, being its item (index), and x pieces, beingits reference value, are associated with the remaining memory capacity.As the other items (categories), there exit the location of the terminaland the moving speed. Additionally, the item (category) may not benotified to the radio terminal. Further, the determination criterioninformation shown in FIG. 7 is only example, and is not limited hereto.

With the determination criterion information shown in FIG. 8, the item(index) and the reference value are associated with the item (category),and as the item (category), there exist the sort of the log (the sort ofthe collected measurement information), the amount of the logs (theamount of the collected measurement information), the acquisitionlocation of the log (the location in which the measurement informationhas been acquired), the acquisition time of the log (the time when themeasurement information has been collected), and the like. For example,in a case of using the sort of the log, when the item (index) isnotified and the radio terminal stores the corresponding sort of thelogs, the radio terminal reports only them to the radio network. In thiscase, the reference value is not required particularly. On the otherhand, in case of using the amount of the logs, the method of using thememory usage amount of the radio terminal for the index is thinkable.Further, in a case of using the acquisition location and the acquisitiontime of the log, the radio terminal compares the location informationand the time information that the radio terminal actually stores withthe notified reference values, and performs the determination.Additionally, these items may be used one by one in some cases, or acombination thereof may be used in some cases. While the determinationcriterion shown in FIG. 8 is preferably used for the determination ofthe log reporting execution basically, they may be used for thedetermination of the measurement execution.

Hereinafter, an example of using the determination criterion based onthe terminal situation as shown in FIG. 7 and the correspondingexecution determination information is shown; however, needless to say,it is also possible to use the method based on the collection situationof the measurement information (measurement log) as shown in FIG. 8.

Continuously, a constitution of the NM 32 will be explained. FIG. 9 is ablock diagram of the NM 32.

An OAM manager 501 performs an operation/administration/maintenance ofan entirety of the radio network.

A communication controller 502 performs a control oftransmitting/receiving the information to/from other radio networknodes, for example, the radio base station via the interface.

A terminal measurement manager 504 decides the information that needs tobe collected, decides a policy for the above collection, and notifies itto the radio base station via an interface 503.

A terminal reporting storage unit 505 stores the measurement informationreported from the radio terminal, and the above measurement informationis read out according to a necessity. The read-out measurementinformation is used for the optimization of the radio network and thelike.

Next, an operation of the radio system constituted as described abovewill be explained.

FIG. 10 is a sequence diagram for explaining a specific operation of thethird exemplary embodiment.

Additionally, in the following, an example will be explained ofnotifying, by the radio base station (eNB) 31, the details (the item andthe reference value) of the determination criterion information that isused for the execution determination, and executing, by the radioterminal, the measurement/the reporting when the execution determinationinformation of the radio terminal (UE) 30 satisfies the notifieddetermination criterion. Further, in this example, it is assumed thatthe measurement/the reporting by the radio terminal (UE) 30 isperiodically performed based on the timer to be notified from the radiobase station (eNB) 31.

At first, the radio terminal (UE) 30 performs the terminal capabilityreporting (UE capability report) (Step 100).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Step 101).

The radio base station (eNB) 31 sends a timer value of the measurementinterval at which the radio terminal (UE) 30 performs the measurement,and a timer value of the report interval at which the measurement log isreported based on the measurement policy (Measurement policy). Further,in this exemplary embodiment, the radio base station (eNB) 31 transmitsto the radio terminal (UE) 30 the determination criterion information aswell that the radio terminal (UE) 30 uses (Measurement decision criteriaconfiguration) (Step 102). Additionally, it is assumed in the followingexplanation that the item (index) is the remaining battery charge andthe determination criterion value is xxW with regard to thedetermination criterion information to be transmitted to the radioterminal (UE) 30 (Measurement decision criteria configuration).

The radio terminal (UE) 30 determines whether or not the executiondetermination information (the terminal situation etc.) of its ownterminal satisfies the notified determination criterion (Measurementexecution decision) (step 103). For example, the radio terminal (UE) 30determines whether the terminal situation of the radio terminal (UE) 30is the remaining battery charge=xx or more. Additionally, the remainingmemory capacity may be used instead of the remaining battery charge. Theradio terminal (UE) 30 does not perform the process of themeasurement/the reporting when this determination criterion is notsatisfied. At this time, the radio terminal (UE) 30 may transmit thereject message (Reject) of the measurement/the reporting similarly tothe case of the above-described first and second exemplary embodiments(not shown in the figure).

On the other hand, when the execution determination information (theterminal situation etc.) of its own terminal satisfies the determinationcriterion (Step 104), the radio terminal (UE) 30 performs themeasurement at the measurement interval based on the notified timervalue and logs the measurement result according to the instructedmeasurement method and reporting method (Measurement logging)(Step 105).

The radio terminal (UE) 30 transmits the measurement log report to theradio base station (eNB) 31 by use of the received radio resource(Measurement log report) (Step 107) when the timer of the reportinterval expires (Step 106). And, the radio base station (eNB) 31transmits an entirety or one part of the received measurement logs tothe NM 32 (Log report) (Step 108).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, in FIG. 10, the timing at which the NM 32 notifies (Policyindication) the measurement policy (Measurement policy) to the radiobase station (eNB) 31 is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, the radio base station (eNB) 31 may previouslymaintain the measurement policy (Measurement policy) in some cases, andit is not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

In addition, while the present invention was applied in the technique ofperiodically performing the measurement/the reporting in this example,needless to say, the present invention may be applied in the techniqueof the event trigger.

Additionally, as a method of notifying the determination criterioninformation (Measurement decision criteria) that is notified from theradio base station (eNB) to the radio terminal (UE) in this example, theRRC signaling is thinkable. In this case, for example, as shown in FIG.11, into an message for notifying the configuration of the operation ofthe measurement and the reporting by the radio terminal (UE), which iscalled “MeansConfig IE (IE: Information Element), may be incorporatedthe above determination criterion information (Measurement decisioncriteria) as “MeansCriteriaConfig” to notify it.

Next, an operation of the radio terminal (UE) 30 will be explained.

FIG. 12 is an operational flowchart of the radio terminal (UE) 30.

At first, the radio terminal (UE) 30 receives the collection/reportingcontrol information related to the measurement method and the reportingmethod (Measurement logging and reporting configuration) (Step 200).Further, the radio terminal (UE) 30 receives the determination criterioninformation (Measurement decision criteria configuration) (Step 201).

Continuously, the radio terminal (UE) 30 determines whether or not theexecution determination information (the terminal situation etc.)satisfies the notified determination criterion (Satisfy measurementcriteria?) (Step 202).

The radio terminal (UE) 30 starts a measurement timer and a reportingtimer (Start measurement timer and reporting timer) when the terminalsituation satisfies the notified determination criterion (Measurementdecision criteria) (Step 203).

The radio terminal (UE) 30 performs the measurement and the positioning(Perform measurement and localization) when the measurement timer hasexpired (Measurement timer expired?) (Step 204), and restarts themeasurement timer (Restart measurement timer) (Step 205).

Continuously, the radio terminal (UE) 30 performs the reporting of themeasurement log (Perform measurement report) when the reporting timerhas expired (Reporting timer expired?) (Step 206), and restarts thereporting timer (Restart reporting timer) (Step 207).

When the process of the furthermore measurement is required, theoperation proceeds to the Step 204, and when it is not required, theprocess is finished (Step 208).

<Modified Example of the Third Exemplary Embodiment>

The case of transmitting the item (index) which was the determinationcriterion and the reference value as the determination criterioninformation was explained in the above-described third exemplaryembodiment. However, the determination criterion information is notlimited hereto, and an ID No. showing the item of the terminal situationand the reference value to be used as the determination criterion may benotified as the determination criterion information. In this case, theradio terminal (UE) previously maintains a table in which the ID No. isassociated with the item (category), the item (index) and the referencevalue. One example of this determination criterion information is shownin FIG. 13. Additionally, the item (category) may be deleted. Inaddition, the reference value may be deleted dependent on the item(index) (for example, the sort of the log as shown in FIG. 8 and thelike).

With the determination criterion information shown in FIG. 13, the IDNo., the item (category), the item (index), and the reference value arestored correspondingly to each other, and for example, the ID No. 1 and2, the communication quality, the RSRP, and x1 dBm and y1 dBm each ofwhich is the reference value thereof are associated each other,respectively. Further, the ID No. 3 and 4, the communication quality,the RSRQ, and x2 dBm and y2 dBm each of which is the reference valuethereof are associated each other, respectively. Hereinafter, thesituation is similar with the other ID No., which are associated withthe remaining battery charge, the location of the terminal, and themoving speed, respectively.

As a method of the execution determination, in a case in which thecommunication channel quality is used, the measurement or the reportingmay be performed when the communication channel quality is equal to ormore than a reference value in some cases, or on the contrary, themeasurement or the reporting may be performed when it is less than (orequal to or less than) a reference value in some cases. While as apreferable method, the method of performing the measurement when it isless than (or equal to or less than) a reference value and performingthe reporting when it is equal to or more than a reference value isthinkable; however, the method of the execution determination is notlimited hereto. The reason is that the measurement requires that theradio network side should grasp the environment in which thecommunication channel quality is worse, and the reporting should beexecuted without applying a load on the radio terminal if possible.Additionally, the number of the reference values is not limited to one,and the reference value may be configured so as to indicate a certainrange. For example, x1-1 dBm or more and yet x1-2 dBm or less, and thelike may be used.

Further, with the case of using the remaining battery charge, themeasurement or the reporting is preferably performed when it is equal toor more than a reference value, and with the case of using the movingspeed, the measurement or the reporting is preferably performed when itis less than (or, equal to or less than) a reference value; however themethod of the execution determination is not limited hereto.

The radio base station (eNB) 31 transmits such an ID No. as thedetermination criterion information to the radio terminal (UE) 30 thatstores the execution determination information. And, the radio terminal(UE) 30 compares the received ID No. with the pre-specified table thatit stores, specifies the item (category), the item (index), and thereference value each of which is the determination criterion, and usesthis as the determination criterion. The following operation is similarto that of the above-described first exemplary embodiment. Additionally,the number of the ID No. could be one in some cases, or could be pluralin some cases.

Further, while a plurality of the reference values were provided for oneitem (category) and one item (index), respectively and the different IDNo. was affixed to each reference value in the above-described modifiedexample, one item (category), one item (index) and one reference valuemay be associated with one ID No. as shown in FIG. 14.

In addition, as shown in FIG. 15, a plurality of the items (categories),a plurality of the items (indexes) and a plurality of the referencevalues corresponding to them may be associated with one ID No.

Additionally, the table as described above may be notified by the radiobase station (eNB) even though it is not specified as a specification.

<Fourth Exemplary Embodiment>

The fourth exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thefourth exemplary embodiment. Additionally, each of the radio terminal,the radio base station, and the NM assumes a similar constitution, soexplanation will be performed with concentrating on different points.

The fourth exemplary embodiment, as shown in FIG. 16, uses a table inwhich one item or more and the reference value corresponding hereto aredefined as a set, and a priority is affixed to each set. Additionally,it is assumed that each of the radio base station (eNB) 31 and the radioterminal (UE) 30 stores the above table.

The radio base station (eNB) 31, which differs from the radio basestation (eNB) 31 of the third exemplary embodiment, transmits only thepriority to the radio terminal (UE) 30. And, the radio terminal (UE) 30performs the measurement and/or the reporting when the executiondetermination information (terminal situation etc.) that it storessatisfies the condition to be indicated by the received priorityinformation.

For example, in FIG. 16, the priority 0 is associated with thecommunication quality and the remaining battery charge, and the movingspeed, the priority 1 is associated with the communication quality andthe remaining battery charge, . . . , the priority 4 is associated withthe remaining battery charge, the priority 5 is associated with thecommunication quality and the moving speed, . . . , and the priority 7is associated with the communication quality.

Herein, it is assumed that the radio base station (eNB) 31 hastransmitted 1 as the priority. Then, the radio terminal (UE) 30 performsthe measurement and/or the reporting when the communication quality isat least x2 dBm or more for the RSRP and is at least y2 dBm or more forthe RSRQ, and the remaining battery charge is xx1 W or more (or theremaining memory capacity is y1 or more) with regard to the terminalsituation of its own terminal. However, the execution determinationmethod is not limited hereto, and for example, the radio terminal (UE)30 may perform the measurement and/or the reporting when thecommunication quality is less than (or equal to or less than) x2 dBm forthe RSRP and is less than (or equal to or less than) y2 dBm for theRSRQ, and the remaining battery charge is xx1 W or more. In addition,the method of using the reference value may be changed depending on theexecution determination of the measurement and the executiondetermination of the reporting (equal to or more than, less than, andthe like).

Additionally, the number of the reference values is not limited to one,and the reference value may be configured so as to indicate a certainrange. For example, x1-1 dBm or more and yet less than x1-2 dBm (or x1-2dBm or less), and the like may be used. Further, both of the remainingbattery charge and the remaining memory capacity may be indicated insome cases, or one of them may be indicated in some cases.

Additionally, the table as described above may be notified by the radiobase station (eNB) even though it is not specified as a specification.

FIG. 17 is a sequence diagram for explaining an operation of the fourthexemplary embodiment. Additionally, in the following explanation, it isassumed that the radio terminal (UE) 30 previously stores a table inwhich the priority is associated. Further, in this example, it isassumed that the measurement and the reporting by the radio terminal(UE) 30 are periodically performed based on the timer to be notifiedfrom the radio base station (eNB) 31.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 300).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Step 301).

The radio base station (eNB) 31 sends the measurement method, thelogging method of the measurement result, and the reporting method ofthe radio terminal (UE) 30 as well as the timer value of the measurementinterval related hereto and the timer value of the report interval atwhich the measurement log is reported as the collection/reportingcontrol information (Measurement reporting and logging configuration)based on the measurement policy (Measurement policy). Further, in thisexemplary embodiment, the radio base station (eNB) 31 transmits to theradio terminal (UE) 30 the priority as well that is applied to the radioterminal (UE) 30. (Priority indicator notification) (Step 302).

The radio terminal (UE) 30 determines whether or not the executiondetermination information (terminal situation etc.) of its own terminalsatisfies the determination criterion corresponding to the notifiedpriority (Measurement execution decision (Step 303). The radio terminal(UE) 30 does not perform the process of the measurement and thereporting when the terminal situation of its own terminal does notsatisfy the determination criterion corresponding to the notifiedpriority. At this time, the radio terminal (UE) 30 may transmit thereject (Reject) message of the measurement/reporting similarly to thecase of the above-described exemplary embodiments (not shown in thefigure).

On the other hand, when the terminal situation of its own terminalsatisfies the determination criterion corresponding to the notifiedpriority (Step 304), the radio terminal (UE) 30 performs the measurementat the measurement interval based on the notified timer value and logsthe measurement result according to the instructed measurement methodand reporting method (Measurement logging) (Step 305).

The radio terminal (UE) 30 transmits the measurement log report(Measurement log report) to the radio base station (eNB) 31 (Step 307)when the timer of the report interval expires (Step 306). And, the radiobase station (eNB) 31 transmits an entirety or one part of the receivedmeasurement logs to the NM 32 (Log report) (Step 308).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, in FIG. 17, the timing at which the NM 32 notifies (Policyindication) the measurement policy (Measurement policy) to the radiobase station (eNB) 31 is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, the radio base station (eNB) 31 may previouslymaintain the measurement policy (Measurement policy) in some cases, andit is not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

In addition, the present invention was applied in the technique ofperiodically performing the measurement/the reporting in this example,and needless to say, the present invention may be applied in thetechnique of the event trigger.

Next, an operation of the radio terminal (UE) will be explained.

FIG. 18 is an operational flowchart of the radio terminal (UE) 30.

At first, the radio terminal (UE) 30 receives the configuration of themeasurement method and reporting method (Measurement logging andreporting configuration) (Step 400). Further, the radio terminal (UE) 30receives the priority as well (Priority indicator notification) (Step401).

Continuously, the radio terminal (UE) 30 determines whether or not theexecution determination information (the terminal situation etc.) is ina situation to be indicated by the notified priority, or in a highersituation (Having higher priority?) (Step 402).

The radio terminal (UE) 30 starts the measurement timer and thereporting timer (Start measurement timer and reporting timer) when theterminal situation is in a situation to be indicated by the notifiedpriority, or in a higher situation (Step 403).

The radio terminal (UE) 30 performs the measurement and the positioning(Perform measurement and localization) when the measurement timer hasexpired (Measurement timer expired?) (Step 404), and restarts themeasurement timer (Restart measurement timer) (Step 405).

Continuously, the radio terminal (UE) 30 performs the reporting of themeasurement log (Perform measurement report) when the reporting timerhas expired (Reporting timer expired?) (Step 406), and restarts thereporting timer (Restart reporting timer) (Step 407).

When the process of the furthermore measurement is required, theoperation proceeds to the Step 404, and when it is not required, theprocess is finished (Step 408).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, the number of the priorities to be notified could beplural.

<Modified Example of the Fourth Exemplary Embodiment>

The case in which the radio base station (eNB) 31 transmitted only thepriority to the radio terminal (UE) 30 was explained in theabove-described fourth exemplary embodiment. However, the transmissionof the priority is not limited hereto.

For example, the radio terminal (UE) 30 previously maintains a table asshown in FIG. 19, and the priority is notified from the radio basestation (eNB) 31. In this case, there exists the method of indicatingthe number of the determination criteria that should be satisfied as thepriority. For example, when the priority 3 is notified, the radioterminal (UE) 30 performs the measurement and/or the reporting when thedetermination criteria of which the priority is 3 or higher (or 3 orlower), out of the determination criteria, are satisfied.

In addition, the radio terminal (UE) 30 regards the notified number (=3)as the priority as the number of the determination criteria that shouldbe satisfied, and performs the measurement and/or the reporting when thethree determination criteria (or more) are satisfied. Further, themethod having the condition for specifying the number of thedetermination criteria that should be satisfied, which are selected inthe descending order of the priority, is also used. For example, whenthe priority 4 is notified, the radio terminal (UE) 30 performs themeasurement and/or the reporting when four determination criteria (ormore), out of the determination criteria, which are selected in thedescending order of the priority (for example, in the ascending order ofthe value), are satisfied.

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

<Fifth Exemplary Embodiment>

The fifth exemplary embodiment will be explained.

The case of supposing a system of the 3GPP LTE (Long Term Evolution)will be explained in the fifth exemplary embodiment. Additionally, eachof the radio terminal, the radio base station, and the NM assumes asimilar constitution, so explanation will be performed withconcentrating on different points.

In the fifth exemplary embodiment, the radio terminal (UE) 30 previouslystores the determination criterion, and the determination criterioninformation is not transmitted from the radio base station (eNB) 31.And, the radio terminal (UE) 30 performs the measurement and/or thereporting when the execution determination information (for example, theterminal situation etc.) that it stores satisfies the determinationcriterion with regard to the terminal situation.

FIG. 20 is a constitution view of the radio communication system in thefifth exemplary embodiment.

The NM (Network Manager) 32 notifies a policy of the measurement, thelogging of the measurement result, and the reporting of the abovelogging by the terminal (Policy indication) to the radio base station(eNB) 31. As a target of this policy, for example, the minimization ofthe drive test (MDT: Minimization of Drive Test. Or it is also called asubstitute for the drive test (Drive Test Substitution)) and the likeare thinkable.

The radio base station (eNB) 31 notifies the measurement method, thelogging method, and the reporting method (Measurement, logging andreporting configuration) to the radio terminal (UE) 30 based on thepolicy of the measurement, the logging of the measurement result, thereporting of the above log (Policy indication).

FIG. 21 is a sequence diagram for explaining an operation of the fifthexemplary embodiment. Additionally, in the following explanation, it isassumed that the radio terminal (UE) 30 stores the determinationcriterion. Further, in this example, it is assumed that the measurementand the reporting by the radio terminal (UE) 30 are periodicallyperformed based on the timer to be notified from the radio base station(eNB) 31.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 500).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Step 501).

The radio base station (eNB) 31 transmits the measurement method, thelogging method of the measurement result, and the reporting method ofthe radio terminal (UE) 30 as well as the timer value of the measurementinterval related hereto and the timer value of the report interval atwhich the measurement log is reported as the collection/reportingcontrol information (Measurement reporting and logging configuration)based on the measurement policy (Measurement policy) (Step 502).

The radio terminal (UE) 30 determines whether or not the executiondetermination information (terminal situation etc.) of its own terminalsatisfies the determination criterion that it stores (Measurementexecution decision (Step 503). The radio terminal (UE) 30 does notperform the process of measurement/the reporting when the terminalsituation of its own terminal does not satisfy the determinationcriterion that its own terminal stores. At this time, the radio terminal(UE) 30 may transmit the reject (Reject) message of the measurement/thereporting similarly to the case of the above-described exemplaryembodiments (not shown in the figure).

On the other hand, when the terminal situation of its own terminalsatisfies the determination criterion that its own terminal stores (Step504), the radio terminal (UE) 30 performs the measurement at themeasurement interval based on the notified timer value and logs themeasurement result according to the instructed measurement method andreporting method (Measurement logging) (Step 505).

The radio terminal (UE) 30 transmits the measurement log report(Measurement log report) to the radio base station (eNB) 31 (Step 507)when the timer of the report interval expires (Step 506). And, the radiobase station (eNB) 31 transmits an entirety or one part of the receivedmeasurement logs to the NM 32 (log report) (Step 508).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, in FIG. 21, the timing at which the NM 32 notifies (Policyindication) the measurement policy (Measurement policy) to the radiobase station (eNB) 31 is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, the radio base station (eNB) 31 may previouslymaintain the measurement policy (Measurement policy) in some cases, andit is not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

In addition, the present invention was applied in the technique ofperiodically performing the measurement/the reporting in this example,and needless to say, the present invention may be applied in thetechnique of the event trigger.

Next, an operation of the radio terminal (UE) will be explained.

FIG. 22 is an operational flowchart of the radio terminal (UE) 30.

At first, the radio terminal (UE) 30 receives the configuration of themeasurement method and the reporting method (Measurement logging andreporting configuration) (Step 600). Further, the radio terminal (UE) 30reads out the determination criterion that it stores (Read outmeasurement decision criteria) (Step 601).

Continuously, the radio terminal (UE) 30 determines whether or not theexecution determination information (terminal situation etc.) satisfiesthe determination criterion with regard to the terminal situation(Satisfy measurement criteria?) (Step 602).

The radio terminal (UE) 30 starts the measurement timer and thereporting timer (Start measurement timer and reporting timer) when theterminal situation satisfies the determination criterion (Measurementdecision criteria) (Step 603).

The radio terminal (UE) 30 performs the measurement and the positioning(Perform measurement and localization) when the measurement timer hasexpired (Measurement timer expired?) (Step 604), and restarts themeasurement timer (Restart measurement timer) (Step 605).

Continuously, the radio terminal (UE) 30 performs the reporting of themeasurement log (Perform measurement report) when the reporting timerhas expired (Reporting timer expired?) (Step 606), and restarts thereporting timer (Restart reporting timer) (Step 607).

When the process of the furthermore measurement is required, theoperation proceeds to the Step 604, and when it is not required, theprocess is finished (Step 608).

<Sixth Exemplary Embodiment>

FIG. 23 is a constitution view of the radio communication system in thesixth exemplary embodiment.

A UE (DM client) 600 corresponds to the radio terminal (UE) 30, a DM(Device Management) server 601 corresponds to the radio base station(eNB) 31, and an NM (Network Manager) 602 corresponds to the NM (NetworkManager) 32. And, respective units operate similarly to the radioterminal (UE) 30, the radio base station (eNB) 31, and the NM (NetworkManager) 32, respectively.

That is, the NM (Network Manager) 602 notifies a policy of themeasurement, the logging of the measurement result, and the reporting ofthe above logging to the DM (Device Management) server 601 (Policyindication). The DM server 601 notifies themeasurement/logging/reporting method to the UE 600, being a DM client(Measurement, logging and reporting configuration). The UE 600 reportsthe log of the measurement result (measurement log) to the DM server601, and the DM server 601 reports the log reported from the UE 600 tothe upper NM 602.

Additionally, in all the above-described exemplary embodiments, thepolicy of the measurement and the reporting was notified from the uppernetwork node (NM) to the radio base station (eNB); however, thenotification is not limited hereto. For example, the radio base station(eNB) itself may decide and configure the policy in some cases, or whiletaking the policy notified from the NM into consideration, the radiobase station (eNB) may changes the above policy.

Further, while an example of the case in which the radio terminalactually performed the measurement and the reporting under (in a cellof) the radio base station having notified the configuration of themeasurement method and the reporting method was shown in all theabove-described exemplary embodiments, the application scope of thepresent invention is not limited hereto. For example, it is possible forthe radio terminal to perform the operation as shown in theabove-described examples so long as the above configuration is valideven after moving to cells of the other radio base stations from thecell of the radio base station having notified the configuration of themeasurement method and the reporting method.

In addition, while the above-described exemplary embodiments basicallysupposed a system of the 3GPP LTE, the application scope of the presentinvention is not limited hereto. For example, the present invention isapplicable to UMTS (Universal Mobile Telecommunication System) to berepresented by WCDMA (Wideband Code Division Multiple Access), WiMAX(Worldwide interoperability for Microwave Access) and the like.

Further, while each unit was constituted with hardware in theabove-described exemplary embodiments, it may be constituted with aprogram that causes an information processor (CPU) to execute theprocesses of the above-described operations.

Above, although the present invention has been particularly describedwith reference to the preferred embodiments and the examples, it shouldbe readily apparent to those of ordinary skill in the art that thepresent invention is not always limited to the above-mentionedembodiment and examples, and changes and modifications in the form anddetails may be made without departing from the spirit and scope of theinvention.

Further, the content of the above-mentioned exemplary embodiments can beexpressed as follows.

(Supplementary note 1) A radio terminal having a function to collect andreport measurement information to be indicated by a radio network,comprising:

means that receives collection/reporting control information related toexecution of at least one of the collection of the measurementinformation and the reporting of said measurement information to theradio network by the radio terminal; and

controlling means that executes at least one of said collection and saidreporting based on said collection/reporting control information whenexecution determination information related to at least one of thecollection and the reporting of said measurement information by its ownterminal satisfies a predetermined determination criterion.

(Supplementary note 2) A radio terminal according to Supplementary note1, wherein said execution determination information includes at leastone of an index of at least one of information related to a situation ofthe radio terminal and information related to a collection situation ofthe measurement information, and an index value of the above index.

(Supplementary note 3) A radio terminal according to Supplementary note1 or Supplementary note 2, comprising an execution determinationinformation collecting means that collects the index values of saidexecution determination information.

(Supplementary note 4) A radio terminal according to one ofSupplementary note 1 to Supplementary note 3, wherein said predetermineddetermination criterion is notified from said radio network.

(Supplementary note 5) A radio terminal according to Supplementary note4, wherein said predetermined determination criterion is incorporatedinto configuration information together with said collection/reportingcontrol information and is notified from said radio network.

(Supplementary note 6) A radio terminal according to one ofSupplementary note 1 to Supplementary note 5:

wherein said predetermined determination criterion includes at least oneindex of said execution determination information, and at least onereference value for said index;

wherein said controlling means executes at least one of said collectionand reporting based on said collection/reporting control informationwhen the index value of the index of said execution determinationinformation, which is corresponding to the index of said predetermineddetermination criterion, satisfies said reference value.

(Supplementary note 7) A radio terminal according to one ofSupplementary note 1 to Supplementary note 6, including a tableindicating at least one combination of the index of said executiondetermination information and the reference value for said index, ormore said combinations:

wherein said predetermined determination criterion is identificationinformation for identifying at least one said combination or more; and

wherein said controlling means compares said identification informationwith said table, specifies the index of said execution determinationinformation corresponding to said identification information, and thereference value for said index, and executes at least one of saidcollection and reporting based on said collection/reporting controlinformation when the index value of the index of said executiondetermination information satisfies said specified reference value.

(Supplementary note 8) A radio terminal according to one ofSupplementary note 1 to Supplementary note 7, including a tableindicating at least one combination of the index of said executiondetermination information, the reference value for said index, and apriority, or more said combinations:

wherein said predetermined determination criterion is at least thepriority; and

wherein said controlling means compares the priority of saidpredetermine determination criterion with said table, specifies at leastthe index of said execution determination information corresponding tothe priority of said predetermined determination criterion, and thereference value for said index, and executes at least one of saidcollection and reporting based on said collection/reporting controlinformation when the index value of the index of said executiondetermination information satisfies said specified reference value.

(Supplementary note 9) A radio terminal according to Supplementary note8, wherein said controlling means compares the priority of saidpredetermine determination criterion with said table, specifies at leastthe index of said execution determination information corresponding tothe priority equal to or higher than that of said predetermineddetermination criterion, and the reference value for said index, andexecutes at least one of said collection and reporting based on saidcollection/reporting control information when the index value of theindex of said execution determination information satisfies saidspecified reference value.

(Supplementary note 10) A radio terminal according to one ofSupplementary note 1 to Supplementary note 9, including a tableindicating at least one combination of the index of said executiondetermination information and the reference value for said index or moresaid combinations:

wherein said predetermined determination criterion is at least a value;and

wherein said controlling means executes at least one of said collectionand reporting based on said collection/reporting control informationwhen the number of the indexes whose index value of said executiondetermination information satisfies said reference value satisfies atleast the number which is the value of said predetermined determinationcriterion.

(Supplementary note 11) A radio terminal according to one ofSupplementary note 1 to Supplementary note 10, wherein the index of saidexecution determination information is:

at least one of a remaining battery charge of the radio terminal,location information of the radio terminal, received strength of apositioning radio wave (GPS radio wave) at the radio terminal, acommunication quality of the radio terminal, and a moving speed of theradio terminal, or a combination thereof; or

at least of one of a sort of the measurement information collected bythe radio terminal, an amount of the measurement information collectedby the radio terminal, a location in which the radio terminal hascollected the measurement information, and a summary of the measurementinformation collected by the radio terminal, or a combination thereof.

(Supplementary note 12) A radio terminal according to one ofSupplementary note 1 to Supplementary note 11, wherein said radionetwork includes at least one of a radio base station, a base stationcontroller, a DM (Device Manager), and an NM (Network Manager).

(Supplementary note 13) A radio communication system for collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising:

notifying means that notifies collection/reporting control informationrelated to execution of at least one of the collection of themeasurement information and the reporting of said measurementinformation to the radio network by the radio terminal;

means that receives said collection/reporting control information; and

controlling means that executes at least one of said collection and saidreporting based on said collection/reporting control information whenexecution determination information related to at least one of thecollection and the reporting of said measurement information by theradio terminal satisfies a predetermined determination criterion.

(Supplementary note 14) A radio communication system according toSupplementary note 13, wherein said execution determination informationincludes at least one of an index of at least one of information relatedto a situation of the radio terminal and information related to acollection situation of the measurement information, and an index valueof the above index.

(Supplementary note 15) A radio communication system according toSupplementary note 13 or Supplementary note 14, comprising an executiondetermination information collecting means that collects the indexvalues of said execution determination information.

(Supplementary note 16) A radio communication system according to one ofSupplementary note 13 to Supplementary note 15, wherein said notifyingmeans notifies said predetermined determination criterion.

(Supplementary note 17) A radio communication system according to one ofSupplementary note 13 to Supplementary note 16, wherein said notifyingmeans notifies configuration information including said predetermineddetermination criterion and said collection/reporting controlinformation.

(Supplementary note 18) A radio communication system according to one ofSupplementary note 13 to Supplementary note 17:

wherein said notifying means notifies the predetermined determinationcriterion including at least one index of said execution determinationinformation and at least one reference value for said index; and

wherein said controlling means executes at least one of said collectionand reporting based on said collection/reporting control informationwhen the index value of the index of said execution determinationinformation, which is corresponding to the index of said notifiedpredetermined determination criterion, satisfies said reference value.

(Supplementary note 19) A radio communication system according to one ofSupplementary note 13 to Supplementary note 18, including a tableindicating at least one combination of the index of said executiondetermination information and the reference value for said index, ormore said combinations:

wherein said notifying means notifies the predetermined determinationcriterion including identification information for identifying at leastone said combination or more; and

wherein said controlling means compares said notified identificationinformation with said table, specifies the index of said executiondetermination information corresponding to said identificationinformation, and the reference value for said index, and executes atleast one of said collection and reporting based on saidcollection/reporting control information when the index value of theindex of said execution determination information satisfies saidspecified reference value.

(Supplementary note 20) A radio communication system according to one ofSupplementary note 13 to Supplementary note 19, including a tableindicating at least one combination of the index of said executiondetermination information, the reference value for said index, and apriority, or more said combinations:

wherein said notifying means notifies the predetermined determinationcriterion including at least the priority; and

wherein said controlling means compares the priority of said notifiedpredetermine determination criterion with said table, specifies at leastthe index of said execution determination information corresponding tothe priority of said predetermined determination criterion, and thereference value for said index, and executes at least one of saidcollection and reporting based on said collection/reporting controlinformation when the index value of the index of said executiondetermination information satisfies said specified reference value.

(Supplementary note 21) A radio communication system according toSupplementary note 20, wherein said controlling means compares thepriority of said notified predetermined determination criterion withsaid table, specifies at least the index of said execution determinationinformation corresponding to the priority equal to or higher than thatof said predetermined determination criterion, and the reference valuefor said index, and executes at least one of said collection andreporting based on said collection/reporting control information whenthe index value of the index of said execution determination informationsatisfies said specified reference value.

(Supplementary note 22) A radio communication system according to one ofSupplementary note 13 to Supplementary note 21, including a tableindicating at least one combination of the index of said executiondetermination information and the reference value for said index or moresaid combinations:

wherein said notifying means notifies the predetermined determinationcriterion including at least a value; and

wherein said controlling means executes at least one of said collectionand reporting based on said collection/reporting control informationwhen the number of the indexes whose index value of said executiondetermination information satisfies said reference value satisfies atleast the number which is the value of said notified predetermineddetermination criterion.

(Supplementary note 23) A radio communication system according to one ofSupplementary note 13 to Supplementary note 22, wherein the index ofsaid execution determination information is:

at least one of a remaining battery charge of the radio terminal,location information of the radio terminal, received strength of apositioning radio wave (GPS radio wave) at the radio terminal, acommunication quality of the radio terminal, and a moving speed of theradio terminal, or a combination thereof; or

at least one of a sort of the measurement information collected by theradio terminal, an amount of the measurement information collected bythe radio terminal, a location in which the radio terminal has collectedthe measurement information, and a summary of the measurementinformation collected by the radio terminal, or a combination thereof.

(Supplementary note 24) A radio communication system according to one ofSupplementary note 13 to Supplementary note 23, wherein said radionetwork includes at least one of a radio base station, a base stationcontroller, a DM (Device Manager), and an NM (Network Manager).

(Supplementary note 25) A radio network in a radio communication systemfor collecting and reporting, by a radio terminal, measurementinformation to be indicated by the radio network, comprising a notifyingmeans that notifies a determination criterion for determining executionof at least one of said collection and reporting by said radio terminalbased on execution determination information related to at least one ofthe collection and the reporting of said measurement information.

(Supplementary note 26) A radio communication method of collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising:

receiving, by the radio terminal, collection/reporting controlinformation related to execution of at least one of the collection ofthe measurement information and the reporting of said measurementinformation to the radio network; and

executing, by the radio terminal, at least one of said collection andsaid reporting based on said collection/reporting control informationwhen execution determination information related to at least one of thecollection and the reporting of said measurement information by its ownterminal satisfies a predetermined determination criterion.

(Supplementary note 27) A radio communication method of collecting andreporting, by a radio terminal, measurement information to be indicatedby a radio network, comprising:

notifying collection/reporting control information related to executionof at least one of collection of the measurement information andreporting of said measurement information to the radio network by theradio terminal;

receiving said collection/reporting control information; and

executing at least one of said collection and said reporting based onsaid collection/reporting control information when executiondetermination information related to at least one of the collection andthe reporting of said measurement information by the radio terminalsatisfies a predetermined determination criterion.

(Supplementary note 28) A program of a radio terminal having a functionto collect and report measurement information to be indicated by a radionetwork, causing the radio terminal to execute the processes of:

receiving collection/reporting control information related to executionof at least one of the collection of the measurement information and thereporting of said measurement information to the radio network by theradio terminal; and

executing at least one of said collection and said reporting based onsaid collection/reporting control information when executiondetermination information related to at least one of the collection andthe reporting of said measurement information by its own terminalsatisfies a predetermined determination criterion.

This application is based upon and claims the benefit of priority fromJapanese patent application No. 2010-002365, filed on Jan. 7, 2010, thedisclosure of which is incorporated herein in its entirety by reference.

REFERENCE SIGNS LIST

1 radio terminal (UE)

2 radio network

11 logging/reporting capability memory

12 measuring/measurement result logging function

13 measurement/reporting execution determining function

14 measurement reporting function

21 OAM policy & OAM requirement enforcement function

22 log storage function

30 radio terminal

31 radio base station

32 NM

600 radio terminal (UE)

601 DM server

602 NM

What is claimed:
 1. A radio terminal comprising: a receiver configuredto receive, from a radio network, a configuration of measurement andlogging including a PLMN-ID (Public Land Mobile Network Identity) and anarea information, wherein the area information includes at least one ofa Cell-ID and a location area to which the radio terminal belongs; atransmitter configured to transmit a report of one or more loggedmeasurement results; and a processor configured to perform measurementand logging of measurement results when a first condition related to thePLMN-ID and a second condition related to the area information aresatisfied, and control the transmitter to transmit, to the radionetwork, the report of the one or more logged measurement results whenthe first condition related to the PLMN-ID is satisfied.
 2. The radioterminal according to claim 1, wherein the first condition is whetherthe a PLMN-ID of the radio terminal is same the PLMN-ID included in theconfiguration of measurement and logging, and the second condition iswhether the radio terminal camp on a cell belonging to an area indicatedby the area information included in the configuration of measurement andlogging.
 3. A radio network comprising: a transmitter configured totransmit, to a radio terminal, a configuration of measurement andlogging including a PLMN-ID (Public Land Mobile Network Identity) and anarea information, wherein the area information includes at least one ofa Cell-ID and a location area to which the radio terminal belongs; and areceiver configured to receive, from the radio terminal, a report of oneor more logged measurement results, wherein the configuration ofmeasurement and logging causes, to the radio terminal, to performmeasurement and logging of measurement results when a first conditionrelated to the PLMN-ID and a second condition related to the areainformation are satisfied, and to transmit, to the radio network, thereport of one or more logged measurement results when the firstcondition related to the PLMN-ID is satisfied.
 4. The radio networkaccording to claim 3, wherein the first condition is whether the aPLMN-ID of the radio terminal is same the PLMN-ID included in theconfiguration of measurement and logging, and the second condition iswhether the radio terminal camp on a cell belonging to an area indicatedby the area information included in the configuration of measurement andlogging.
 5. A method of a radio terminal comprising: receiving, from aradio network, a configuration of measurement and logging including aPLMN-ID (Public Land Mobile Network Identity) and an area information,wherein the area information includes at least one of a Cell-ID and alocation area to which the radio terminal belongs; performingmeasurement and logging of measurement results when a first conditionrelated to the PLMN-ID and a second condition related to the areainformation are satisfied; and transmitting, to the radio network, areport of the one or more logged measurement results when the firstcondition related to the PLMN-ID is satisfied.
 6. A method of a radionetwork comprising: transmitting, to a radio terminal, a configurationof measurement and logging including a PLMN-ID (Public Land MobileNetwork Identity) and an area information, wherein the area informationincludes at least one of a Cell-ID and a location area to which theradio terminal belongs; and receiving, from the radio terminal, a reportof one or more logged measurement results, wherein the configuration ofmeasurement and logging causes, to the radio terminal, to performmeasurement and logging of measurement results when a first conditionrelated to the PLMN-ID and a second condition related to the areainformation are satisfied, and to transmit, to the radio network, thereport of one or more logged measurement results when the firstcondition related to the PLMN-ID is satisfied.